Understanding React JS Classes: Why They Still Matter in 2025

At Fusion Software Institute, we focus on providing industry-relevant knowledge for aspiring developers, and one fundamental concept in React is React JS Classes. Although modern React now leans toward functional components, class-based components remain a key part of understanding how React works, especially in older or enterprise-level projects.

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What is React JS?

Master React.js for dynamic web applications. Learn hands-on with practical projects. Dive into React's component-based architecture and JSX syntax. Explore state management, routing, and lifecycle methods. Enhance proficiency with modern JavaScript and popular libraries like React Router and Redux. Build scalable, interactive user interfaces. Whether a beginner or experienced developer, mastering React.js opens doors to powerful web development.

Unlike functional components, which are typically used for simple UI rendering and have no internal state or lifecycle methods, class components offer a lot more flexibility. They have their own internal state (for managing dynamic data), as well as lifecycle methods that allow developers to hook into different stages of the component's lifecycle (e.g., when it's created, updated, or destroyed). This makes class components particularly useful in situations where developers need more control over a component’s behavior.

Join Fusion Software Institute's Power BI course in Pune. Gain hands-on experience in data visualization, dashboard creation, and reporting with expert mentors. Our comprehensive curriculum covers Power BI Desktop, DAX functions, and data modeling to enhance your data analysis skills. React JS Classes might not be the latest trend, but they remain a fundamental part of the React ecosystem.

React Classes vs. Functional Components

While React class components have their advantages, they are gradually being replaced by functional components in modern React development. Functional components are simpler, less verbose, and, with the introduction of Hooks, they now have access to state management and lifecycle methods that were once exclusive to class components.

Understanding React JS Classes

React JS Classes refer to a method of creating components using JavaScript’s class-based syntax. These components are designed to handle complex logic and provide more features compared to the simpler functional components. They were the primary way to build components in React before the introduction of Hooks.

Features of React JS Classes

Class components allow for internal state management and provide lifecycle methods that control the behavior of components at different stages, such as mounting, updating, and unmounting. This gives developers greater control over how their application responds to user interactions and data changes.

Another important aspect of React JS Classes is how they handle context and event binding. Developers working with class components need to understand how the this keyword behaves in different scenarios, which is an essential concept in JavaScript in general.

Importance in Modern Development

While the React community has largely shifted toward functional components due to their simplicity and the power of Hooks, understanding React JS Classes remains critical. Many existing applications and libraries still rely heavily on class components. Knowing how they work enables developers to maintain legacy systems or collaborate with teams using older codebases.

Additionally, a deep understanding of class components strengthens overall React knowledge. It helps in grasping concepts like component lifecycle, rendering logic, and state transitions, all of which are foundational in any React application.

When to Use React JS Classes

React JS Classes are commonly used in older projects, large-scale applications, and situations where developers prefer a structured, object-oriented approach. While they are less common in new projects, their relevance persists in professional environments where backward compatibility and long-term support are important.

Conclusion

In summary, React JS Classes continue to be an important part of the React ecosystem. Even as functional components become the preferred approach, a solid understanding of class-based components enhances a developer’s ability to work across different project types. At Fusion Software Institute, we ensure our students are equipped with both modern and foundational skills, making them confident and capable in real-world development scenarios.

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Join Fusion Software Institute's Power BI course in Pune. Gain hands-on experience in data visualization, dashboard creation, and reporting with expert mentors.